CAJ | 학술논문

曲轴孔精加工工序的精度将直接影响发动机的寿命与品质，而先进合理的夹具系统是加工精度的重要保障。针对某企业对缸体曲轴孔精加工精度要求，确定了工艺参数及定位基准，在此基础上，对夹具系统的定位机构、让刀机构、夹紧机构及镗模等主要结构进行了设计与分析。最后，分析了镗杆的动态特性，并研究了轴承刚度对镗杆动态特性的影响，适当提高轴承预紧力即轴承刚度，能有效提高镗杆系统的刚度。经实际加工检验，验证了设计的正确性。
곡축공정가공공서적정도장직접영향발동궤적수명여품질，이선진합리적협구계통시가공정도적중요보장。침대모기업대항체곡축공정가공정도요구，학정료공예삼수급정위기준，재차기출상，대협구계통적정위궤구、양도궤구、협긴궤구급당모등주요결구진행료설계여분석。최후，분석료당간적동태특성，병연구료축승강도대당간동태특성적영향，괄당제고축승예긴력즉축승강도，능유효제고당간계통적강도。경실제가공검험，험증료설계적정학성。
Since the precision of finishing operations for crankshaft hole wil directly affect the qual-ity and life of the engine,an advanced and reasonable fixture system is very important for the machining accuracy.According to the precision requirement of cylinder crankshaft hole in the real applications,the process parameters and the positioning reference were determined in this pa-per,and the main structure of fixture system was designed and analyzed including the positioning mechanism,cutter relieving mechanism,clamping mechanism and boring mold.Final y,the dy-namic characteristics of the boring bar were analyzed,and the effect of bearing stiffness on the dynamic characteristics of the boring bar was studied as wel .By appropriately increasing the bearing preload,i.e.,bearing stiffness,the stiffness of the boring bar system could be effective-ly increased.Based on the practical process inspection,the correctness of the design has been tested and verified.